Horn or whistle.



E. B. CHAPMAN.

HORN OR WHISTLE.

APPLICATION FILED 001. 23, 1911 1,048,942 Patented Dec. 31, 1912.

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' WITNESSES: INVENTOR i W 64 ww m i a /6Z% BY A TTORNEY cOLUMmAPLANouRAPH 60.. WASHINGTON. B4 C4 UNITED STATES PATENT OFFICE.

EVERETT B. CHAPMAN, 013 BOSTON, MASSACHUSETTS, ASSIGNOlR, T0 SOLOMON A.CAMPBELL, OF NEWTON, MASSACHUSETTS.

HORN OR WHISTLE.

T 0 all whom it may concern:

Be it known that I, EVERETT B. CHAPMAN, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Horns or IVhist-les, of which the following is a full,clear, and exact description.

This invention relates to certain improvements in horns or whistlesadapted to be operated at will by the proper control of gas as, forinstance, the exhaust gas of an internal combustion engine.

My invention relates more particularly to signals of that characterwherein there is employed a sound chamber supported by the exhaustconduit and having an opening across which the gas is permitted to flowduring the operation of the signal.

One of the main objects of my invention is to insure the properrelationship of the sound chamber, its opening, the size of the gasdelivery passage or slot and the angle of delivery of the gas. To securethis object I form a permanent slot for the gas at the proper positionand in parts rigid with the sound chamber and provide means whereby atwill the gas may be prevented from freely escaping from the gas conduitand the slot may be uncovered, opened or rendered accessible to the gas,so that the latter may blow through the slot and across the soundchamber opening to operate the signal.

Another object of my invention is to prevent the gas from blowing acrossthe sound chamber opening when the signal is out of operation byprotecting, covering or deflecting the gas away from the slot andproviding an independent outlet for said gas.

A further object of my invention is to render the signal more compactand less liable to injury and capable of being secured in place wherevery little room is available by utilizing one or more tubes as thesound chamber and supporting these tubes closely adjacent to andparallel with the conduit.

A still further object of my invention is to so construct the signalthat it may be readily attached to a conduit intermediate the ends ofthe latter without necessitating the removal of the conduit or theemployment of special machinery other than means for cutting a hole inthe side of the conduit.

Imay secure these objects in various ways,

Specification of Letters Patent.

Application filed October 23, 1911.

Patented Dec. 31,1912.

Serial No. 656,094.

but I preferably employ one of the forms shown in the accompanyingdrawings forming a part of this specification and to which reference isto be had.

In these drawings similar reference characters indicate correspondingparts in the different views.

Figure 1 is a top plan View of a signal constructed in accordance withmy invention and applied to the conduit intermediate the ends of thelatter; Fig. 2 is a central longitudinal section on the line 22 of Fig.1; Fig. 3 is an end View of the device shown in Fig. l; and Fig. 4 is aface view of the valve plate employed within the conduit.

In the form illustrated I utilize a conduit 10, which may be a sectionof the exhaust pipe between the engine and muflier or in the rear of themuffler or at the eX- treme rear end of the conduit. This conduit has ahole 11 cut in the side thereof and over this hole is secured a casingor plate 12 held in place in any suitable manner.

'As shown, the casing, plate or cover has outwardly extending flanges 13at diametrically opposite sides of the conduit and adapted to be clampedto two curved bars 14:, as is clearly shown in Fig. 3. The plate, casingor cover member 12 has a sound chamber rigidly secured thereto and inthe form illustrated in the drawing, this sound chamber includes twotubes 15 and 16 lying side by side parallel to each other and to theconduit, and each having a closed end and an open end. Closely adjacentto the open end the member 12 has a slot 17 through which the gas mayescape from the interior of the conduit in such a direction as to crossthe opening and produce the sound.

The member 12 serves to support a movable device for closing or coveringthis slot and normally preventing the escape of gas. This device in theform illustrated operates substantially as a turning plug and includes ahalf round bar 18 j ournaled in the casing 12 directly below the slot 17so that when it is rotated, it closes the slot in the same manner as anordinary turning plug. This valve or turning plug carries a plate orwing 19 upon its lower edge, the said plate or wing being of such shapeand so placed that when the turning plug is moved to uncover the slot17, the plate will swing across the conduit and substantially close thelatter and prevent the gas from passing along said conduit beyond saidslot. I have illustrated the plate or valve 19 as being secured to thevalve member 18 by a suitable screw, but it is, of course, evident thatit might be secured in any other suit able manner or that the two mightbe formed integral. I have not illustrated any means for rotating themember 18, as such means constitutes no portion of my present invention.Any lever, gear, spring or other device may be employed for oscillatingthe member 18 and causing it and the valve plate 19 to assume either theposition shown in Fig. 2 or a position in which the member 18 closes theslot 17, and the member 19 lies closely adjacent the wall of the casingor cover member 18. It will be noted that this device may be applied toany conduit without removing the latter and without requiring any othertools than means for sawing or cutting the opening 11. As the soundchamber does not project outwardly from the conduit but to only a slightextent, it is evident that the signal may be secured in place where verylittle room is available, and as the sound chamber engages with thecasing or cover member 12 for a considerable distance, itis evident thatthese two may be very rigidly secured together. Furthermore, it will benoted that in case the high pressure of the gas or the presence of sootor dirt in the conduit prevents the closure 19 from moving into perfectcontact with the lower edge of the conduit, as shown in Fig. 2, stillthe slot 17 may be fully uncovered and the gas delivered across theopening in the proper direction. This is due to the fact that the slot17 has a permanent relationship to the sound tubes and is uncoveredbefore the closure 19 reaches its final position.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

An alarm or signal including a conduit having a main outlet and aseparate auxiliary outlet in the form of a slot, a sound chamber rigidwith said conduit and having an opening adjacent to said slot and amember having a pivot portion adjacent to the side of said conduit atsaid slot and normally closing the latter and a leaf portion carriedthereby and movable to substantially close said main outlet upon therotation of said pivot portion to uncover said slot.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

EVERETT B. CHAPMAN.

Witnesses:

JAMES W.. Fosrnn, V. I. GLYNN.

Copies of this patent may he obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

